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We assume what you mean is that your spare had never been used, but in actuality it wasn't new. It is accepted within the industry and in RV circles that 7 years is the age you want to change your tires, whether they have 30,000 miles or 0. Some say 5 years. I have gone much longer than that by having the tires inspected annually and keeping them minimally exposed to the sun, but there is a limit, and it sounds like your spare reached it. It likely shouldn't have been used any farther than it took to find a tire store and a replacement.
